Cathode active substance for lithium ion battery, cathode material containing cathode active substance and lithium ion battery

A negative electrode active material, lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve the problems of poor electrical conductivity, limited application, high price, etc.

Inactive Publication Date: 2012-10-03
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, the mass-specific capacity of sulfur-containing binary compound anode materials is high, which is more than twice that of traditional commercial graphite electrodes, but these sulfur-containing binary compound anode materials have poor electrical conductivity and are expensive, which limits their use. Applications in large-scale energy storage and power batteries

Method used

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  • Cathode active substance for lithium ion battery, cathode material containing cathode active substance and lithium ion battery
  • Cathode active substance for lithium ion battery, cathode material containing cathode active substance and lithium ion battery
  • Cathode active substance for lithium ion battery, cathode material containing cathode active substance and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] CuFeS 2 as negative electrode active material

[0044] CuFeS prepared by solvothermal method 2 powder, figure 1 CuFeS 2 Powder XRD and CuFeS 2 The comparison chart of the standard spectrum (JCPDS card No.24-0211). The red curve in the figure is CuFeS 2 XRD spectrum of the powder, the black histogram is CuFeS 2 standard map. Comparative illustration of synthesized CuFeS 2 The powder has high purity and good crystallinity.

[0045] The electrochemical properties of the negative electrode active material can be determined by the following test methods:

[0046] 1. Preparation of negative electrode material electrode sheet. Negative electrode active material Cu x m y S z , the binder and the conductive agent are mixed according to a certain ratio (such as 80:10:10), and an appropriate amount of 1-methyl-2-pyrrolidone (NMP) is added, ground with an agate mortar, and fully stirred to a paste slurry. Coat it evenly on the copper foil (about 200um thick) (us...

Embodiment 2

[0055] CuTi 2 S 4 as negative electrode active material

[0056] Preparation of spinel-type CuTi by solvothermal method 2 S 4 Powder, assembled into test cell according to embodiment 1, test CuTi 2 S 4 electrochemical performance.

[0057] At a scan rate of 0.001 V / s, a cyclic voltammetry test was performed at 0.1 V to 3.0 V (testing instrument such as: electrochemical workstation (Shanghai Chenhua Instrument Co., Ltd.), model: CHI660D). The first cycle test results show that there are two oxidation peaks at 0.35V and 0.6V, and there is a broad reduction peak at 2.0V~2.4V. Charge and discharge test between 0.1V~3.0V and 0.5V~3.0V with 0.04mA current (testing instrument such as: BTS high-precision battery testing system (manufactured by China Xinwei Electronics Co., Ltd.), model: CT-3008W- 5V10mA-S1). The 0.1V~3.0V cycle results show that the first discharge specific capacity is 746mAh / g, and after 10 cycles, the discharge specific capacity is lower than 100mAh...

Embodiment 3

[0060] CuCr 2 S 4 as negative electrode active material

[0061] Preparation of spinel-type CuCr by solvothermal method 2 S 4 Powder, assembled into test cell according to embodiment 1, test CuCr 2 S 4 electrochemical performance.

[0062] At a scan rate of 0.001 V / s, a cyclic voltammetry test was performed at 0.1 V to 3.0 V (testing instrument such as: electrochemical workstation (Shanghai Chenhua Instrument Co., Ltd.), model: CHI660D). The first cycle test results show that there are two oxidation peaks at 0.35V and 0.6V, and there is a broad reduction peak at 2.0V~2.4V. Use 0.04mA current to conduct charge and discharge test between 0.1V~3.0V and 0.5V~3.0V (testing instrument such as: BTS high-precision battery detection system (manufactured by China Xinwei Electronics Co., Ltd.), model: CT-3008W- 5V10mA-S1). The 0.1V~3.0V cycle results show that the first discharge specific capacity is 746mAh / g, and after 10 cycles, the discharge specific capacity is lower...

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Abstract

The invention discloses a cathode ternary compound CuxMySz active substance for a lithium ion battery, a cathode material containing the substance and the lithium ion battery using the cathode material as a cathode. M in the chemical formula CuxMySz belongs to an IVB group, a VB group, a VIB group, a VIII group, an IIB group and an IVA group in a fourth period and a fifth period in periodic table of chemical element and is any one in metal elements of an IIIA group in third, fourth, fifth and sixth periods, such as Ti, Cr, Mo, Fe, Al, Ga, In, Tl, Sn and the like. The active substance has higher charge-discharge capacity which is about two times that of commonly used graphite material in the charge-discharge capacity, thereby being a novel lithium ion battery cathode material with good application prospect and high capacity.

Description

【Technical field】 [0001] The invention relates to an active material of a negative electrode for a lithium ion battery, a negative electrode material containing the active material, and a lithium ion battery using the negative electrode material as a negative electrode. 【Background technique】 [0002] In today's world, with the development and progress of human society, energy issues and pollution issues have attracted more and more attention, and the development and application of new pollution-free energy sources have become increasingly urgent. Lithium-ion batteries have the characteristics of high specific energy, high specific power, long cycle life, no memory effect, clean and pollution-free, and are valued by various countries. The structure of lithium-ion batteries includes positive electrode materials, negative electrode materials, separators and electrolytes, among which negative electrode materials are one of the key parts that affect the electrochemical performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/20C01G23/00C01G37/00C01G39/06C01G49/12C01G3/12C01G15/00C01G19/00H01M4/58H01M4/136
CPCY02E60/122Y02E60/10
Inventor 关士友叶治群韩广帅王丽侠
Owner EAST CHINA UNIV OF SCI & TECH
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